Seasonal and annual variations of CO 2 and CH 4 at Shadnagar, a semi-urban site.

Autor: Sreenivas G; Earth and Climate Sciences Area (ECSA), National Remote Sensing Centre (NRSC), Indian Space Research Organization (ISRO), Hyderabad 500037, India; Department of Physics, Jawaharlal Nehru Technological University Hyderabad (JNTU-H), Hyderabad 500085, India., P M; Earth and Climate Sciences Area (ECSA), National Remote Sensing Centre (NRSC), Indian Space Research Organization (ISRO), Hyderabad 500037, India. Electronic address: mahesh_p@nrsc.gov.in., Mahalakshmi DV; Earth and Climate Sciences Area (ECSA), National Remote Sensing Centre (NRSC), Indian Space Research Organization (ISRO), Hyderabad 500037, India., Kanchana AL; Earth and Climate Sciences Area (ECSA), National Remote Sensing Centre (NRSC), Indian Space Research Organization (ISRO), Hyderabad 500037, India., Chandra N; Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 2360001, Japan., Patra PK; Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 2360001, Japan., Raja P; Indian Institute of Soil and Water Conservation (IISWC), Research Centre, Ooty, The Nilgiris, India., Sesha Sai MVR; Earth and Climate Sciences Area (ECSA), National Remote Sensing Centre (NRSC), Indian Space Research Organization (ISRO), Hyderabad 500037, India., Sripada S; Department of Physics, Jawaharlal Nehru Technological University Hyderabad (JNTU-H) College of Engineering, Jagityal 505501, India., Rao PVN; Earth and Climate Sciences Area (ECSA), National Remote Sensing Centre (NRSC), Indian Space Research Organization (ISRO), Hyderabad 500037, India., Dadhwal VK; National Institute of Advanced Studies (NIAS), Bengaluru 560012, India.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 May 01; Vol. 819, pp. 153114. Date of Electronic Publication: 2022 Jan 15.
DOI: 10.1016/j.scitotenv.2022.153114
Abstrakt: Carbon dioxide (CO 2 ) and methane (CH 4 ) are the most important greenhouse gases (GHGs) due to their significant role in anthropogenic global climate change. The spatio-temporal variations of their concentration are characterized by the terrestrial biosphere, seasonal weather patterns and anthropogenic emissions. Hence, to understand the variability in regional surface GHG fluxes, high precision GHGs measurements were initiated by the National Remote Sensing Center (NRSC) of India. We report continuous CO 2 and CH 4 measurements during 2014 to 2017 for the first time from Shadnagar, a suburban site in India. Annual mean CO 2 and CH 4 concentrations are 399.56 ± 5.46 ppm and 1.929 ± 0.09 ppm, respectively, for 2017. After the strong El Niño of 2015-2016, an abnormal rise in CO 2 growth rate of 5.5 ppm year -1 was observed in 2017 at the study site, compared to 3.03 ppm year -1 at Mauna Loa. Thus, the repercussion of the El Niño effect diminishes the net uptake by the terrestrial biosphere accompanied by increased soil respiration. Seasonal tracer to tracer correlation between CO 2 and CH 4 was also analyzed to characterize the possible source-sink relationship between the species. We compared CO 2 and CH 4 concentrations to simulations from an atmospheric chemistry transport model (ACTM). The seasonal phases of CH 4 were well captured by the ACTM, whereas the seasonal cycle amplitude of CO 2 was underestimated by about 30%.
Competing Interests: Declaration of competing interest The authors declare that they have no conflict of interest.
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Databáze: MEDLINE
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